SilcBool silc_socket_stream_set_qos(SilcStream stream,
                                        SilcUInt32 read_rate,
                                        SilcUInt32 read_limit_bytes,
                                        SilcUInt32 limit_sec,
                                        SilcUInt32 limit_usec)

    Sets a "Quality of Service" settings for socket stream `stream'.
    The `read_rate' specifies the maximum read operations per second.
    If more read operations are executed the limit will be applied for
    the reading.  The `read_limit_bytes' specifies the maximum data
    that is read.  It is guaranteed that silc_stream_read  never returns
    more than `read_limit_bytes' of data.  The `limit_sec' and `limit_usec'
    specifies the time limit that is applied if `read_rate' and/or
    `read_limit_bytes' is reached.  If all arguments except `stream'
    are zero this resets the QoS from the socket stream, all QoS for
    this socket stream that may be pending will be cancelled.